From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail.linuxfoundation.org ([140.211.169.12]:43684 "EHLO mail.linuxfoundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753070AbeAEWMx (ORCPT ); Fri, 5 Jan 2018 17:12:53 -0500 Subject: Patch "nbd: fix use-after-free of rq/bio in the xmit path" has been added to the 4.9-stable tree To: axboe@fb.com, gregkh@linuxfoundation.org, jbacik@fb.com Cc: , From: Date: Fri, 05 Jan 2018 23:12:42 +0100 Message-ID: <15151903621354@kroah.com> MIME-Version: 1.0 Content-Type: text/plain; charset=ANSI_X3.4-1968 Content-Transfer-Encoding: 8bit Sender: stable-owner@vger.kernel.org List-ID: This is a note to let you know that I've just added the patch titled nbd: fix use-after-free of rq/bio in the xmit path to the 4.9-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: nbd-fix-use-after-free-of-rq-bio-in-the-xmit-path.patch and it can be found in the queue-4.9 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let know about it. >>From 429a787be6793554ee02aacc7e1f11ebcecc4453 Mon Sep 17 00:00:00 2001 From: Jens Axboe Date: Thu, 17 Nov 2016 12:30:37 -0700 Subject: nbd: fix use-after-free of rq/bio in the xmit path From: Jens Axboe commit 429a787be6793554ee02aacc7e1f11ebcecc4453 upstream. For writes, we can get a completion in while we're still iterating the request and bio chain. If that happens, we're reading freed memory and we can crash. Break out after the last segment and avoid having the iterator read freed memory. Reviewed-by: Josef Bacik Signed-off-by: Jens Axboe Signed-off-by: Greg Kroah-Hartman --- drivers/block/nbd.c | 32 +++++++++++++++++++++++--------- 1 file changed, 23 insertions(+), 9 deletions(-) --- a/drivers/block/nbd.c +++ b/drivers/block/nbd.c @@ -272,6 +272,7 @@ static int nbd_send_cmd(struct nbd_devic int result, flags; struct nbd_request request; unsigned long size = blk_rq_bytes(req); + struct bio *bio; u32 type; if (req->cmd_type == REQ_TYPE_DRV_PRIV) @@ -305,16 +306,20 @@ static int nbd_send_cmd(struct nbd_devic return -EIO; } - if (type == NBD_CMD_WRITE) { - struct req_iterator iter; + if (type != NBD_CMD_WRITE) + return 0; + + flags = 0; + bio = req->bio; + while (bio) { + struct bio *next = bio->bi_next; + struct bvec_iter iter; struct bio_vec bvec; - /* - * we are really probing at internals to determine - * whether to set MSG_MORE or not... - */ - rq_for_each_segment(bvec, req, iter) { - flags = 0; - if (!rq_iter_last(bvec, iter)) + + bio_for_each_segment(bvec, bio, iter) { + bool is_last = !next && bio_iter_last(bvec, iter); + + if (is_last) flags = MSG_MORE; dev_dbg(nbd_to_dev(nbd), "request %p: sending %d bytes data\n", cmd, bvec.bv_len); @@ -325,7 +330,16 @@ static int nbd_send_cmd(struct nbd_devic result); return -EIO; } + /* + * The completion might already have come in, + * so break for the last one instead of letting + * the iterator do it. This prevents use-after-free + * of the bio. + */ + if (is_last) + break; } + bio = next; } return 0; } Patches currently in stable-queue which might be from axboe@fb.com are queue-4.9/nbd-fix-use-after-free-of-rq-bio-in-the-xmit-path.patch